Freshmeat page: http://freshmeat.net/projects/adzapper/
adzapper is a filtering proxy that blocks ads from being downloaded and displayed by your web browser. Instead of ad banners, you see blank spaces: adzapper transforms the ads into transparent gifs. adzapper runs on Linux, Windows, and most Unix platforms and has a web-based user-interface. It is written in Python, with performance and flexibility in mind-- it's small and fast, and its filter rules are in XML-based site-specific files ("zaplets") that are easy to make and share. (adzapper will have use the Python license in the next release.)
License: ZPL (Zope Public License)
This project has the following developers:
New HTML Parser: The long-awaited libxml2 based HTML parser code is live. It needs further work but already handles most markup better than the original parser.
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If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!